A few more example notebooks

[kosack]

• the ctapipe tutorial from the last CTA meeting
• a quick work in progress example of using VPython for a 3D cross-check display

[codecov]

Codecov Report

Merging #757 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #757   +/-   ##
=======================================
  Coverage   69.49%   69.49%           
=======================================
  Files         198      198           
  Lines       10708    10708           
=======================================
  Hits         7441     7441           
  Misses       3267     3267

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